7439561 has 2 divisors, whose sum is σ = 7439562. Its totient is φ = 7439560.

The previous prime is 7439543. The next prime is 7439567. The reversal of 7439561 is 1659347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5953600 + 1485961 = 2440^2 + 1219^2 .

It is an emirp because it is prime and its reverse (1659347) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7439561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7439567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3719780 + 3719781.

It is an arithmetic number, because the mean of its divisors is an integer number (3719781).

Almost surely, 2^7439561 is an apocalyptic number.

It is an amenable number.

7439561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7439561 is an equidigital number, since it uses as much as digits as its factorization.

7439561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 7439561 is about 2727.5558656057. Note that the first 3 decimals coincide. The cubic root of 7439561 is about 195.2161617816.

It can be divided in two parts, 7439 and 561, that added together give a cube (8000 = 20³).

The spelling of 7439561 in words is "seven million, four hundred thirty-nine thousand, five hundred sixty-one".